Spring corn high yield fertilization four determined
Torsion Spring is a kind of Spring with complicated design principle in all kinds of Spring. The change of type is also very lively, so the theory involved in design is also the most complicated.
The coils are tightly or separately wound to allow for torsional loads (at right angles to the spring axis) . The end of the spring can be wound into a hook or a straight torsion arm.
Torsion Spring is the ultimate variant Spring, from single Torsion Spring to double Torsion Spring, and even all kinds of Torsion bar deformation, according to design molding. Therefore, it is difficult to master the necessary information of the torsion spring: (1) the free length. (2) control diameter: (a) outside diameter, (b) inside diameter, (c) inside diameter of the casing, or (d) outside diameter of the Rod through which it passes. (3) wire size [Wire diameter". (4) materials (type and grade). (5) number of turns: (A) total number of turns and (b) right or left. (6) Torque: The number of points deflected to an angle. (7) maximum deflection (the angle from which the free position is calculated) . (8) terminal form.
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First, determine the appropriate ratio
To determine a reasonable proportion of nitrogen, phosphorus and potassium fertilizer application, and strive to balance fertilization. The ratio of nitrogen, phosphorus and potassium absorption is roughly 100:37:84. Combined with the high utilization rate of nitrogen and potassium and low utilization rate of phosphorus, it is important to supplement nitrogen, moderate phosphorus and potassium in fertilization. The application ratio of nitrogen, phosphorus and potassium is roughly 100:60:40, and it is recommended to implement formula fertilization.
Second, determine the amount of high-yield fertilization
To determine a reasonable amount of fertilizer, it is necessary to produce fertilizer and soil fertility. 1 kg of nitrogen, phosphorus and potassium can increase the yield of 8-10 kg of grain. Generally, for every 100 kg of grain produced, the soil production capacity is calculated as 60%. It requires 3.43 kg of pure nitrogen, 1.23 kg of phosphorus and 2.36 kg of potassium.
Third, determine the number of scientific fertilization
Strive to make each fertilizer supply effective and reasonable, to do the end fertilizer, seed fertilizer, top dressing and application. Generally, the base fertilizer can be fertilized on the basis of 1000-1500 kg of organic fertilizer, 15 nitrogen ~ 15 phosphorus ~ 15 potassium (universal type), 20 nitrogen ~ 15 phosphorus ~ 5 potassium (middle or more fertile) or 16 nitrogen ~ 12 Phosphorus ~ 12 potassium (low-yield or infertile) 20 ~ 25 kg, 20 to 25 kg of urea in the big bell period, 10 ~ 15 kg of urea in the ear stage.
Fourth, determine the efficient fertilization method
A reasonable fertilization method should be adopted. The application of the base fertilizer should be combined with the organic fertilizer and the chemical fertilizer. The fertilization method can be applied before the arable land, or can be combined with the machine; the seed fertilizer should be strictly separated from the seed or the rigorously defined variety is phosphoric acid. Diammonium, the application rate of 5 kg or less can be mixed with corn seeds; the top dressing should be in the jointing-booting stage, that is, the small bell mouth-big bell mouth, 10-15 cm from the base of the stem, and the mechanical side is deep. Apply to 10 ~ 15 cm, or people, power to open the ditch, apply and timely cover the soil.
Author: Zhu Chunhua
Source: Hubei Agricultural News